118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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/*
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* Mesa 3-D graphics library
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* Version: 6.5.2
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef P_UTIL_H
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#define P_UTIL_H
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#include "p_compiler.h"
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#define CALLOC_STRUCT(T) (struct T *) calloc(1, sizeof(struct T))
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/** Clamp X to [MIN,MAX] */
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#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
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/** Assign X to CLAMP(X, MIN, MAX) */
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#define CLAMP_SELF(x, mn, mx) \
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( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
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/** Minimum of two values: */
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#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
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/** Maximum of two values: */
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#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
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#define Elements(x) sizeof(x)/sizeof(*(x))
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union fi {
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float f;
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int i;
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unsigned ui;
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};
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#define UBYTE_TO_FLOAT( ub ) ((float)(ub) / 255.0F)
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#define IEEE_0996 0x3f7f0000 /* 0.996 or so */
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/* This function/macro is sensitive to precision. Test very carefully
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* if you change it!
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*/
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#define UNCLAMPED_FLOAT_TO_UBYTE(UB, F) \
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do { \
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union fi __tmp; \
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__tmp.f = (F); \
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if (__tmp.i < 0) \
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UB = (ubyte) 0; \
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else if (__tmp.i >= IEEE_0996) \
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UB = (ubyte) 255; \
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else { \
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__tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F; \
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UB = (ubyte) __tmp.i; \
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} \
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} while (0)
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static INLINE unsigned pack_ub4( unsigned char b0,
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unsigned char b1,
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unsigned char b2,
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unsigned char b3 )
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{
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return ((((unsigned int)b0) << 0) |
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(((unsigned int)b1) << 8) |
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(((unsigned int)b2) << 16) |
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(((unsigned int)b3) << 24));
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}
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static INLINE unsigned fui( float f )
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{
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union fi fi;
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fi.f = f;
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return fi.ui;
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}
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static INLINE unsigned char float_to_ubyte( float f )
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{
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unsigned char ub;
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UNCLAMPED_FLOAT_TO_UBYTE(ub, f);
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return ub;
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}
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static INLINE unsigned pack_ui32_float4( float a,
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float b,
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float d,
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float c )
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{
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return pack_ub4( float_to_ubyte(a),
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float_to_ubyte(b),
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float_to_ubyte(c),
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float_to_ubyte(d) );
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}
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#endif
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